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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c362499a6b97450365d38d285effbbf3f14f0f746be083562fc3280b6115dd38' 
  AND token = 'x6NoxZbtMR+DEOIeytndO6Pa+iYAxIBVnwlJ7Ehp9Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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