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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f29ea1fc2bd40a36d8b4d3e40c211d5493eff911b991985b76b8589b49e25ce0' 
  AND token = 'egYk6Jq8fKOe96NgOi4wZXhPFAPUSfokcTTKu2coqx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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