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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a56b4b1547b5699f2a9dc5ad009410bb6f0a1a5da5c8441df269c94ee6aab9aa' 
  AND token = 'tFt3PQGrznFa3SlcElQ1u4jV1jUwy1OZfFwLo7zorgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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