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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c9bbb40c216f98ac01d3e31a13933ea84ff407a06eba3c7b8717501afcd5e7f' 
  AND token = 'nO5oVjcWuc+HVxzccNHwxvObhRKiJsejevmLopj74bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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