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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f0aa676003f0f3f0044ab51dadefd82863a639b2d5bd461451caf3ad2e4c85b' 
  AND token = 'Xlxe3N4DQhkqwrk8PsRI8ZWggmy+F4sA5ykCt1zIVoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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