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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4acde5e06644f95d0ba71a5228da21b3bd282c8007ba5d5c15529d28e21128a' 
  AND token = 'o2j7PQHvhO6bE0fTW4r1qLcCq2fStr8CobSCQ7pd3Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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