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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bba54189a7077bc2bf7dd9aab2882e8d71545e505f62a2e4b11c84a1f471da28' 
  AND token = '0Prj/F6HoVMgGJArFPrVtS+cE2eZEnluc5u9aOPWZo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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