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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6644798a76a02d0318ad68eb101c3b347643a3dacc26b32ada11448c0be1f6c5' 
  AND token = 'M3LlsczTGhQv/WNh4e6U45IQqNfldLloj0Ptq0HZvoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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