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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2142fc14b2dc06c8e2adc9c75a8b20c2c54445591f1b79955259072dac4847d7' 
  AND token = 'ywytPUN8oZAXrwNprf3miRgASI6VuuLcF88mRnzIXAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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