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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c96d87ebee0b861baa009e68626878601fcd0355dcca03302e500a0ce89d702' 
  AND token = '3HcVHAiTrzINtjKUloZDtZam8sZLRhtRJj7VmQTTsdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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