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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf70e93c786b31f8c6305473c38db8f966ae823bd26c1e9dc9fcbbe711d85407' 
  AND token = 'mjFdPpkVk3MtxwFls9xLZcA9Bs3cZWeWz2z/X5xatJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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