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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3999c03a615f8d038ce989a81f45cc82bdc93fc9830f56f12d3da30b3bca349d' 
  AND token = 'NxH15MOH+TDOF2wxrRwkvd0W9OLvS1/qMcwa3r8jSXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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