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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5dc74c8453d1146c01f8b62bf440a480618d44541805fb113a2cb909667ef0c' 
  AND token = 'PLDYcfSDmsf97DYZw0DJ87vacHye4QFM64w/mPBuzdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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