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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688919638adf726dd1a0f55df99fb6fd0f2e0c6d450a2e47db1d74ecda0b82b7' 
  AND token = 'VTqgpGpcape+fut10UGvZTDNbuXwmlPIMzmW8UiyUsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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