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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acb3718d02081a783e7ef4c81235fc4d6b1d4ef94236c84c2ea94486d4898efc' 
  AND token = 'qfnuN9zDdMuNk43Jn99NUVHGZSHRV3RMSQFmogf+yCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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