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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3bf8ab3e5e0e2e6d09e8983b74cee32693a67fe8701f2c848fc81c11735d8b' 
  AND token = 'e9DEaYkrj9yw+Y1l66xE6Cna0GyanXAgASDUq/t8QY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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