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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b831995c12ed789bcb927f3b4db221def3b6f6c5f3c1d3135e152b5404e8288e' 
  AND token = 'xpegtBbj2vKulauxft0VPbIIHp0e9r33fVaA5tLIWLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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