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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1326e832e3f36030a7972d61b3e5c43befe8226341b2b5d7137edadb5f1433b5' 
  AND token = 'lzaTW/diBkDQCx5jiZ6vRk5pW4/V+UcwyQqZwDUNTi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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