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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72e36ea93b1a11c2de96fbd06a0d195ac7e306c900aa901a24f19a2b4b2b812c' 
  AND token = 'pzg+tGU8+d1E2RAH3g66pD4UVh8aVTbUNwM8EurbJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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