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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e890eddaca5a9c5e709cd4f63543e3089cd77af885b7c67cc774816a3593153a' 
  AND token = '+SiKpTpSgCSyEdbc3+l/pG5StqU9Qvz5uIC5J2vSQbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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