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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579c02c5f0051a93c5f679ebf6951198f8b3008a140436fff3c67a2be150a637' 
  AND token = 'mv40J/ejg71EdkyQQgfTTe1K3T27BrhFLM36k0ggmQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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