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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '649a9aa6bccf3a2ea3bff3d0077ac664b12c69e45390de359391641c55dd598d' 
  AND token = '3GYlHy4t1VTbyhR07hl+vvx3qQDOU47kQVgKXb9r3VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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