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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4289419155ac84e046dcd1cf1d66a4abd0a470bd7f1838cc314b11305c3bee2' 
  AND token = 'ltBSLsEZjvpxt0xYFaSxUvU2RNols6ZnOe0tLuIIkn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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