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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e608cef9e5d6815d22d8ef3cc999c41dbee0d16d73caac54c889c3f24a29f2ad' 
  AND token = 'amrDAXo93IDcdbjF18tftNFuvUDdoa7UvmVaW8TMVg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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