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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff54346427c04d8ca3e012e4310b3d345fa70b3ff801da0cb5332b270fb6f5a0' 
  AND token = 'FBLibAnKv4Y/ilUQyVMk5yWrJVYdf8niaUmKytwansc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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