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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cc700475b1f191119048afa0074aa7bdf437a5784f43da47b5562916cc7aede' 
  AND token = 'JeOvZJfmS8e/7hlot0ncOH2B5fJUlmNptU0Z9YIIjRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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