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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3294e60d0add675d1c49525fbe9d841792189c1e89e2b4a6b51e069df5e41860' 
  AND token = '3TVudGwOaxrfIDUEfSJBxmPLriNcrfsre5KIANz3Qkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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