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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87d0f987681c3a41716b031d75dc795c64ed56e2cd9fb88a9098c720dcd6d54d' 
  AND token = '57SJ2AbZx5i3h6LlKlq0Gmmk5leZubt1DfF/tiCA0O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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