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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18e20c9c3950a504d3c64a26957b405451e5669d770734d1a956b86e451d6351' 
  AND token = 'RecblMxBzqipX/ONJVYBbI6nbNLIyYxOBrlaKUpunmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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