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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db459efc1d63ccd05b355b80d15a9e38f04f72438ba9dc1a7f3893f83634b981' 
  AND token = 'IRzbocYWzK7/XZaZzgtrAMuApHhRLu5RF6LZCrNC3C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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