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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70935d991de333968dc22eeb6dfe7904aea2f680e3d5216f8a23cf1d7f3c950' 
  AND token = '1AQwxkIrwQABEmSBr4JIpTzEv6dIllQr8tmlZxx6n/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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