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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3532b6cfb38d7827711f8e2528ace27b890f7e244f413e284ff7771c77e89da3' 
  AND token = 'yqdhMA0spYaYIH6HiJ2sxadG2IDYk3hBrp1Zo9fZ4IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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