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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf4f4916eb5f1d1763af77d1a8a1f3dd911e353e922e819d018f902941299d99' 
  AND token = 'ZRCuQzfCkJXEHygMUv5EaWjg4CBDn75hWvXROHynDow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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