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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d6f59f1adc75afb14979857a7c6435bd9f4b561157a353c77faa2436eb4282c' 
  AND token = 'OQF7W+ehd+xUBeuVa3JF9mVupJDncalC/rsOkFTsOjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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