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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2f8c3915e07eedf8ed42ae39cf745895aa41579e4b77d3e920107200b5d1384' 
  AND token = 'SongXkETGh0usjShG9Nf3Lv8vW8P8xX/HkE1BbQfLpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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