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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c39b1f86d3f576a5f95077175eaf93626a37d5db0e659579e1cab13a92b7aa37' 
  AND token = '+Xu/GM0PfRvI5fDFKTZtSi7YqItNzy4twa1V9aqgLsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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