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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac17c15085d529b78708bb2c1d791ecfe1c7116f7be15a645e263f0e1f476400' 
  AND token = 'o7WvN/Xd3soVDjM36NRtG0yom2NtUyoYIfmuDVJt1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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