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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0837d065adc8c6c508725a51a358c1649054a6080dd66f21885b40538c130896' 
  AND token = 'cR4qiMxYWDV4rhgJQD1WneKa3UMFxnM+UYQ732wYKoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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