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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e3c4426f8baea36623f6385fc585182655d6a1a159b0329d4130bab4e5a8fb' 
  AND token = 'flnNS3LU7mmm3FAgqzPqDxW8tHQyCynla1mylBX7qo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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