SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bf30dc2158e49520171ff292707c64cb6b110aed104a1ef0f53e3acd802c41b' 
  AND token = 'QU4/2tVnWBv/IrXfjaCPZJZMpP1EYN+SRw3gPUkTRCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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