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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cf1f11fee27ceb2caac425b63699d84e8684dad367c0f307b131abf2a2a54f6' 
  AND token = 'I+MTiOuZ86mM3J3ZYH2CS1nIlMqS3E/Qlv5EtqTRfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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