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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '110c5c7daf269570acdfb262993f73042f72c00de4f4c7cc34d91b6c72eaf798' 
  AND token = '3F2q+5ip6LgxNYcoaIHi6JUJ1/fNrY3jxbXa/3fcn8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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