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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08788523e73045d4c92fdc775f1f30c6f727322337d927ae2a46a6586ca271e2' 
  AND token = 'sc4C6kgEwM4MniCK8Rn/qtImFSxHTtuaMR8LK3i3tvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}