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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87fde9df6994f4a2ac913b105c51884a648f4cc5e3ea418358b9df57ac5428b' 
  AND token = 'gN9F9KvJwdFV5fnuxEeeU4i3PtWY3RA+qRdNg2xJ4Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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