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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97f71dff2726c35d88200237e85461a9e63d64e6e7acc69179190b2b66666e28' 
  AND token = 'j4tat2OiSm2PR5XIqzm8Iaj0TR6SnEBiPmmocvFpfmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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