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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cb8d639dc095a3063d48092d1fb2addfe1b5feb1816444141bcd25caae89360' 
  AND token = 'XkFF0d0h57cVU4R1s9TsVHTe4BLHUB1nV8arraJfgOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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