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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cee0cad7fdaa56245ba6e0e45bd830d74b6742e2d9b19c4e1105ddf7730577d' 
  AND token = 'QAANIxvz3X433Uds8vb2PefwiNoz/W4Lbv+rHPVcfUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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