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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fb41f9d96df71e86f900386aa634689a68b68dc9d2dd7097e229de63087544d' 
  AND token = 'ET2ljcW05AVl9kzJsMtMpPH7mzmiDbWhV5k1nivUc+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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