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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6c04cc32607b8d3675893ff8d1b5d35c378da3947e5f47273cb3d8c9350067b' 
  AND token = 'f7W3CSKZYMcV9WsMeBKujvUiYl3QKqGQIebCkdC90+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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