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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80bf00f8785ae63063df57bddbc9c0c757301fc53b1af046d1f5d9a634f0a3b9' 
  AND token = 'SRcq3Hodhcn2EA/mawibMeTO9jLekWA9M4xpP0EY6iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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