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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ee436863bb4dd8a59205a86f63b30f3df52a9c996a63b8195c6c47fef8f0285' 
  AND token = '19+AvoQB8zZ7Rid8cNum7KHWHdTVLxf+cv35PCnWM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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