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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d7ef4eb180d48107ffe2b5f544cf3b558b305bd3d0264a7b254cd85ac927d79' 
  AND token = 'ZT3lViGqrQXiC/I38kMltbwC/nVkUztzd8bT+xS/ZcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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