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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd861c52c0bc8fc4f0a5c9d13584da7bd2f296fbf5ded7604a0a6cfa6e6a51a7a' 
  AND token = 'ymfcTbzehs+8C+u6PpwApIUVNPWHKapM/ecCAk50umY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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