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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd13a98fb21002303fe40f27dd604dd17bc3fc86221d8e38da2e7757d9a26e7a6' 
  AND token = 'vE4JBPzxOkFKXPefTXY7i0Rgdd/foIy4gHzzD28scNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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