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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb51e960d18edb770d9b13ff0f67e8186ed50ecb16ea9ccb0f70c706a8c2051' 
  AND token = '6evCZW9UH5fSp3aqpXIogbFS7PWSj3eClmQWeJKvv4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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