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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a123051595a2cf3511e8f03efe15d6a7cadc3dd02fe5d9b042028c56ff7301' 
  AND token = 'CPqnLuikclsXo1WwLYJYmrDNRkzHg3YQnlF04sBzp9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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