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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '755a3c5c024839ba5f566e54e10ee319634e1cde28dd4a1efada77ad85037858' 
  AND token = 'VAbtGHdUI7q17v7KxPMRkTO42DydFdy/m8KLdr8AlVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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