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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c071dc90eab865a40b81d5e9037697c8d4154d56c0e1994696a96bc35904416' 
  AND token = 'oFpPmMIKMjINYR5wdbzoOUgiGlCn5N2IEosT9E6mvh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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