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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd50c29dfaea0e965cadf26089e776fd86a5b315994edfb99110862124f57ae6a' 
  AND token = 'JStPV9h14xuciPxJ16lTLdmQ7LWxTniUIcgNkSJVW8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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