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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f6ab7ad18364cdfd87172d549433c5087f355b7e42f66e97f2b669aefd52f2a' 
  AND token = '3EmHF5WlBX2VmxcEQvixojx88dvbuOsGQnWZbqAlQaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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