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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a96aa8a4f2df7ae57a0e709fcc91892a7557510a2da4b6d37980bccc87759f2e' 
  AND token = '3B7prKN+Q6hjFTQFym73SaG5FalA13R4l/UVxZQsWpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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