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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8da2e770dfe09817954de9270e7195f83ff6e5c9ccd794f5f7986d0e9aa589de' 
  AND token = 'WhCbMqmrHOhW2yloZKHo+puSLtQTW5t/xFxqm3SV7Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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