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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e86219161f106dd9f2e20977f43afb09ae62ad99123c1e4fccd3b29ccf8642c1' 
  AND token = 'naykA215ZXAqPe8aI8L+w1AFE5rsFbtJ1ZQsuw1Pe4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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